PH

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A measure of the concentration of protons (H+) in a solution and, therefore, its acidity or alkalinity.

The formula for calculating pH is:

-LOG10[H+]

([H+] means the concentration of H+ ions, and is measures in moles per litre)

A pH of 7 indicates neutrality, e.g. pure water. A lower pH number indicates increasing strength of acidity, and a higher pH number indicates increasing strength of alkilinity.